<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
<style>
  [v-cloak]{
      display: none;
  }
</style>

<script src="../js/vue.js"></script>
<div id="app" v-cloak>{{message}}</div>

<script>
  setTimeout(function () {
    const app = new Vue({
      el:'#app',
      data:{
        message:"第一次，系统的学VUE"
      }
    })
  },2000)

</script>

</body>
</html>